George wilson



(No Model.)

G. WILSON.

COMBINED LOW WATER ALARM AND SAFETY VALVE FOR STEAM BOILERS.

Patented Dec. 6,1881.

N. PETERS. Plwlo'lilhugmphtr. Wmhlngkm D. C.

UNITE STATES PATENT GEORGE W'ILSON, OF OLD KENT ROAD, COUNTY OF SURREY, ENGLAND.

COMBINED LOW-WATER ALARM AND SAFETY-VALVE FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 250,618, dated December 6, 1881.

Application filed August 24, 1881. (No model.) Patented in England January 31, 1881.

To all whom it may concern Be it known that I, Gnoncn WILsoN, a subject of the Queen of Great Britain, and residing at Old Kent Road, in the county of Surrey, England, have invented an Improved Oombined Low-Water Alarm and Safety-Valve for Steam-Boilers, (for which I have obtained a patent in Great Britain, No. 416, dated 31st January, 1881,) of which the following is a specification.

My said invention relates to a peculiar combined arrangement of safety-valve and lowwater alarm, to be used in connection with steam-boilers for the purposes of calling attention to excessive pressure or deficiency of water therein, whereby many boiler explosions could be timely prevented. For this purpose I provide a small dome or chamber fixed on the top of the boiler, the said chamber being divided by a diaphragm into an upper and lower chamber, of which the former has a whistle fixed upon it, and the latter is in permanent communication with the steam-space of the boiler. The low-water-alarm valve is seated in the diaphragm and opens downward,

.of a spring adjusted by a perforated screw,

according to the pressure at which it is desired that the valve shall operate. The chamber has a removable cover for inspection, but which may be locked to prevent tampering with the valves.

In order that my said invention may be fully understood, I shall now proceed more particularly to describe the same, and for that purpose shall refer to the accompanying drawing, which represents a part transverse section of a steam-boiler with myimproved safety-valve and low-water-alarm apparatus appliedit-hereto.

A is part of a steam-boiler of any suitable known construction, on which is mounted the metallic dome B, of any convenient shape,

which may be supported by a saddle-piece, O, or other similar device. The interior of the dome is formed with a diaphragm, D, so as to provide suitable seats and bearings for the valvular mechanism before referred to.

H is a conical liftvalve, seated at h within the tubular chamber K, and which is suitably loaded by a spiral spring, I, and capable of adjustment by means of a screw-cap, or the perforated plug k. The valve H is capable of reciprocating in a vertical plane under pressure, so as to allow the excessive steam to pass from the boiler into the chamber K and find its exit therefrom by the lateral passages, m, and also through the perforated plug at 70, both communicating with the outer inclosingdome, B. By raising or lowering the screwcap or plug 70 by means of a spanner the loading of the valve H may be varied to suit the requirements of working-pressure to be maintained within the boiler, and beyond which limits it may not be desired to exceed.

The second conicalvalve, F, capable of opening downward, is held to its seatf under normal circumstances by the elevation of the float E, which is connected to the valve by the rod f, and which falls with the height of the waterlevel within the boiler. The rod f passes through an aperture, 0, formed in a sleeve, F, passing through the shell of the boiler, and of sufficient size to allow free passage of the steam around the said rod to the interior of the dome. The rod working in guides f 3 is provided with a suitable stop formed by a pin, f workin gin a slot in the sleeve F, or other similar device, to prevent the valve Fdroppin g too far, so as to cause it to permanently leave the passage which it isintended to control, or from falling, with its rod,bodily into the interior of the boiler when the water is removed therefrom.

Gr is a whistle or other suitable alarm mounted on the dome B, and communicating with the interior thereof by the passage g, and through which the valves may be lubricated.

Now, assuming excessive steam-pressure to have been generated and accumulated within the boiler, which elevated abnormal pressure correspondingly exists within the cavity or chamber L through passage 0 communicating therewith, the valve H is immediately raised so as to relieve such pressure. Steam having thus passed the valve it travels through the chamber K, and by the passages m and 7a to the upper cavity, M, and from whence it makes its final escape through g, so as to blow or actuate the whistle or alarm G, and so call attention to the dangerous impending state of affairs. All the moving parts being inclosed and secured within the dome or casin g,it prevents the possibility of any onetampering with the same. Now, conversely, assuming the pressure to be fluctuating, through insufficiency of water in the boiler, contingentupon negligence, or the water therein allowed to get low from any other cause, (as would be the case if the injector failed to properly work,) then the float E havin g similarly followed the subsidence of the water line or level, it efiects by its connection the downward opening of the valve F, thereby permitting the escape of sfifficient pressure of steam through M to blow the whistle or sound the alarm Gr, so as to attract attention to such condition of the boiler.

I do not desire to claim, broadly,a combined safety-valve andlow-water alarm; but

I claim as my invention- 25 The combination of a steam-boiler with a dome, B, having a steam-whistle on its upper part, and divided into an upper and lower chamber by a diaphragm, D, having two communicating openings, one closed by a loaded valve 0 opening upward, and the other by a valve opening downward, and carried by the rod of a float within the boiler.

In testimony whereofI have signed my name to this specification in the presence of two sub- 35 scribing witnesses.

GEORGE WILSON.

Witnesses:

GHAs. MILLs, I. S. MAYHEW, Both of N0. 47 Lincolns Inn Fields, London. 

